Looking for a good not-quite-new laptop

Checking here for recommendations; I'm thinking cir. 2013 or so. Would prefer dedicated gpu, probably 15", good quality and all, you know, usuals – cheapest possible, naturally. Asus usually seems good; I often like thinkpads but it seems you generally pay a bit of a premium there.
Also possibly where to buy them—some of the older models I can't find listed at all on places like amazon.

Any opinions much appreciated

Thanks